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CVE-2022-31103

25
FAUCET Score

CVE-2022-31103 is a denial-of-service vulnerability affecting lettersanitizer versions below 1.0.2, and by extension, react-letter, due to improper handling of CSS @keyframes at-rules. With a CVSS score of 7.5 (HIGH), this vulnerability can be exploited remotely with low attack complexity, leading to a complete denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.2CPE matchmatch criteria
cpe:2.3:a:lettersanitizer_project:lettersanitizer:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.42%
Probability of exploitation in next 30 days
EPSS Percentile
70.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0142 is in the 51st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: lettersanitizerFixed in: 1.0.2

Vendor Advisories (1)

npmGHSA-7r3r-gq8p-v9jjhigh

Improper handling of CSS at-rules in lettersanitizer

Jun 23, 2022

References

github.com / mat-sz/lettersanitizer/commit/96d3dfe2ef0465d47324ed4d13e91ba0816a173f
PatchThird Party Advisory
github.com / mat-sz/lettersanitizer/security/advisories/GHSA-7r3r-gq8p-v9jj
Third Party Advisory
github.com / mat-sz/react-letter/issues/17
Issue TrackingThird Party Advisory